Red Seal Cosmetology Practice Exam

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What are long chains of amino acids joined together by peptide bonds called?

  1. Polypeptide chains

  2. Protein fibers

  3. Keratin structures

  4. Amino sequences

The correct answer is: Polypeptide chains

Long chains of amino acids joined together by peptide bonds are called polypeptide chains. Protein fibers are composed of multiple polypeptide chains, but this term refers specifically to the individual chains themselves. Keratin structures are a type of protein found in hair and nails, but not all proteins are keratin structures. Amino sequences is not a commonly used term for polypeptide chains and does not accurately describe them as chains of amino acids. Therefore, the correct answer is A.

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